.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}

#spinner {
    position: fixed;
    top: 50%;
    left: 50%;
    z-index: 1001;
}